You need to do more _______ if you wnat to be strong and fit.A exercise B exercises C an exercise D exercising

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You need to do more _______ if you wnat to be strong and fit.
A exercise B exercises C an exercise D exercising

A
这里的exercise 作锻炼讲,不可数

A exercise

A

选B,应为exercise当锻炼讲是可数的,例如一些体操什么的都是分节的。